1, Xiaohong has twice as many pencils as Xiaoming. She took out 2/kloc-0 pencils and donated them to Project Hope, which is exactly half of the total number of Xiaohong and Xiaoming. Xiaohong's original pencil was _ _ _ 21× 2 = 42,42 ÷ (2+1.

When the number A is divided by the number B, the quotient is 16. If the number A is multiplied by 2 and the number B is divided by 2, the quotient now is: _ _16× 2× 2 = 64 _ _ _ _ _ _ _.

3. Assuming that the difference between two numbers is 2645, the quotient of division is 8, and the sum of these two numbers is:

_2645÷(8- 1)×(8+ 1)_____________

4. The car travels at half speed in front of 10 minutes, at full speed in the back 10 minutes, and at 2 1 km for 20 minutes. The car runs at full speed every hour: 10÷2=5 minutes, 2 1 ÷ (65438.

5. When reading the decimal point, Xiao Ya lost and the result was 5300 1. The original decimal point only read a zero, and the original decimal point was: _ _ 530.01_ _ _ _ _ _ _ _ _ _ _ _.